/// <summary>
/// Event handler for incoming XML messages; raised by XmlSocketIO class.
/// Currently only scans for digital output events and passes them to phidgets
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private static void xmlIO_XmlIn(object sender, XmlInEventArgs e)
{
Console.WriteLine("Msg in: {0}",e.Text);
// XmlTextReader is a simple forward-only XML parser
XmlTextReader reader = new XmlTextReader(e.Text,XmlNodeType.Element, null);
// scan through received XML from beginning to end:
while(reader.Read())
{
if(reader.Name == "event") //this is the element name
{
if(reader.GetAttribute("type").Equals("digital_out"))
{
// load values passed in attributes
byte index = Convert.ToByte(reader.GetAttribute("index"));
bool val = Convert.ToBoolean(reader.GetAttribute("value"));
phidgetsKit.Outputs[index].State=val;
}
// add code for other outputs (e.g., servo motor) here
}
}
}
/// <summary>
/// When a complete message (\0 terminated?) has been received,
/// rasie the XmlIn event and pass the message in the event
/// </summary>
/// <param name="asyncResult"></param>
void OnCompletedRead(IAsyncResult asyncResult)
{
int bytesRead = stream.EndRead(asyncResult);
if (bytesRead > 0)
{
// careful when passing non-ascii strings!
String s = Encoding.ASCII.GetString(readBuffer, 0, bytesRead);
// raise XmlIn event
XmlInEventArgs e = new XmlInEventArgs(s);
XmlIn(this,e);
// go back to reading the port
stream.BeginRead(readBuffer, 0, readBuffer.Length,
readCallBack, null);
}
}